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Separates optional, undefined, null, and invalid external data, then narrows values at the correct boundary.
Explains a constraint-first approach to responsive layout, intrinsic sizing, overflow, and content resilience.
Explains capturing, targeting, bubbling, default behavior, and safe event delegation for dynamic interfaces.
Connects JavaScript tasks and microtasks to rendering, responsiveness, and practical performance fixes.
Uses discriminated unions to represent valid UI states and make transitions exhaustive.
Explains why external data needs runtime validation even when the application uses TypeScript.
Explains assignability by shape, excess-property checks, and the gap between compile-time compatibility and runtime identity.